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John (and anyone else who needs it)
I saved most of the oil mod messages when they appeared on the list. I
pasted them together in one message for your modification pleasure :-)
Rusty
-----Original Message-----
From: Ken Welter [mailto:rotary.coot@verizon.net]
Sent: Monday, March 18, 2002 9:26 PM
To: flyrotary@olsusa.com
Subject: taping oil galley
This is a trick that Rob Golden at Pineapple racing turned me on to,
he did dyno testing and found 15 degree drop in oil temp measured
before the cooler by doing this, you drill out the plug in the side
of the front housing and tap it to take the oil strait out of the oil
pump to eliminate all the small oil passages and 90 degree bends in
the front cover, then you plug the outlet on the front cover, this
way you can still use the injector if you wish and the pressure
relief valve functions as normal, Also do away with the banjo on the
return line as it is very restrictive.
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From Ken Welter
A 1/4 pipe tap will run down the existing hole, I have drilled and
tapped one to 3/8 but the housing gets a bit thin, I then run the
fitting in with red lock tight so I don't have to torque it real
tight.
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I fitted Ken Welter's direct outlet oil trick to my RV6A and am pleased tp
report that it worked. It dropped the oil temperature enough to enable me to
block off one of my air outlets louvres. This increased top spead from
180mph to nearly 190mph. Also fuel burn at cruise speed decreased by about
5%. Any more ideas Ken? My next step is out with the thermostat, bung up
the bypass hole and fit a 20lb. cap. Next speed 200mph!
Ian 13B RV6A Australia.
beadles@webace.com.au
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G,day Mike.
The mod. is easily done if the side of the engine is clear. I drilled out
the brass plug with a 12mm drill, then drilled the hole out to 14mm and ran
in a 16mm tap. I used a straight 16mm adapter and O ring Stratoseal. That is
an O ring captive in a washer. Then plugged the front hole. The only danger
is getting swarf into the oil system.
Ian.
Ian, can you please explain how you did this on an already flying engine?
Did you have to tear it all the way down?
Mike Wills
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I haven't looked in a while but I think the oil inlet at the bottom rear
of the engine just goes through the banjo and then up to the filter adapter.
If you are running a remote filter adapter, you can leave out this part of
the oiling system and run the oil line direct to the filter adapter. Just
block off the hole where the banjo screws in. That leaves out a banjo, a 90
degree turn and about a 25 degree turn. Plus the passages inside the block
are on the small side.
Lynn E Hanover
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